PT-2025-34197 · Mattermost · Mattermost

Hackit_Bharat · Published 2025-08-21 · Updated 2025-08-29 · CVE-2025-53971

Positive Technologies (AI Summary)

CVSS v3.1

3.8

Low

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: Mattermost versions 10.5.x through 10.5.8 Mattermost versions 9.11.x through 9.11.17

Description: Mattermost fails to properly validate authorization for team scheme role modifications. This allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint. The vulnerable parameter is user-id.

Recommendations: Mattermost versions 10.5.x through 10.5.8: Apply appropriate authorization checks to the /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint to prevent unauthorized role modifications. Mattermost versions 9.11.x through 9.11.17: Apply appropriate authorization checks to the /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint to prevent unauthorized role modifications.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2025-53971

GHSA-4276-CM8C-788H

GO-2025-3902

Affected Products

Mattermost

References · 10

• https://osv.dev/vulnerability/GHSA-4276-cm8c-788h · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-53971 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-53971 · Security Note
• https://osv.dev/vulnerability/GO-2025-3902 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/advisories/GHSA-4276-cm8c-788h · Note
• https://t.me/CVEtracker/30571 · Telegram Post
• https://pkg.go.dev/vuln/GO-2025-3902 · Note
• https://twitter.com/CVEnew/status/1958444193396769198 · Twitter Post
• https://mattermost.com/security-updates · Note